asereda-gs commented on a change in pull request #800:
[CALCITE-2460][CALCITE-2459] Add implementation of To_Base64 and From_Base64
to SqlFunctions
URL: https://github.com/apache/calcite/pull/800#discussion_r288689267
##########
File path: core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java
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@@ -121,6 +124,36 @@
private SqlFunctions() {
}
+ /** SQL TO_BASE64(string) function*/
+ public static String toBase64(String string) {
+ if (string == null) {
+ return null;
+ }
+ String base64 = new
String(Base64.getEncoder().encode(string.getBytes(UTF_8)), UTF_8);
+ String temp = base64;
+ StringBuilder str = new StringBuilder();
+ while ((temp.length() / 76) > 0) {
+ str.append(temp.substring(0, 76));
+ str.append("\n");
+ temp = temp.substring(76, temp.length());
+ }
+ base64 = str.append(temp).toString();
+ return base64;
+ }
+
+ /** SQL FROM_BASE64(string) function*/
+ public static String fromBase64(String base64) {
+ if (base64 == null) {
+ return null;
+ }
+ try {
+ base64 = base64.replaceAll("[\\t\\n\\r ]", "");
Review comment:
Probably `\s` is better:
From docs
> \s A whitespace character: [ \t\n\x0B\f\r]
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